回复：回复：回复：父母分开两地办移民好吗? 母亲现在美国, 父亲现在中国, 手上有B2签证

For travel purpose, AOS is indeed better, and when they receive AP, they can go travel to China. But if you parents have no need to visit US in the next 1 to 2 years, doing CP is as good as AOS.